Future Transportation Systems - Decreasing Fuel Consumption and Exhaust Gas Emissions in Transportation - page 268

wind wind power plant power plant

frequency and tension
control

rectifier

switch

virtual synchronous engine

electric vehicle with
charging device

plug-in hybrid vehicle

power supply one way power supply both directions

Fig. 17.7 Connection of the electric grid to electric cars for charging and storing energy

energy supplier. The vehicle will be able to communicate with the on-board power
supply system or its account data management at the recharging station.

17.1.2.4 The Electric Motor Vehicle as a Storage System

Renewable energy has the disadvantage of variable production which often does
not meet the demands of industry or consumers. The power output of wind and
solar power plants entirely depends on the weather; but energy consumption
depends on the time of day. It would be ideal if electric cars could store and use
renewable electric energy.
The additional power of wind or solar plants could be stored in the batteries of
electric cars. This would improve the alternative network management and sim-
plify the regulation of the net's stability; see Fig. 17.7 [ 19 ].
The timing of charging electric cars is very beneficial for the electric supply
because motor vehicles should be recharged when the current is cheaper, i.e., at night.
Workers would drive to work in the morning and while parked at their place of
employment the extra current from the car could be fed back into the net at a top price.